.Starry Landscape Stacker finds the brightest stars that are common across all files and identifies them as red dots. It uses these dots to try and identify the sky vs the land.Automatic Dot placement will usually work best. Your job is to remove any red dots from the landscape by using the Eraser.
Mac: Starry Landscape Stacker. Starry Landscape Stacker on macOS. Starry Landscape Stacker is the program I use, it is incredibly good at automatically finding the stars to make a mask for the sky, so that the foreground is not included in the alignment process.

Starry Landscape Stacker Mac Starry Landscape Stacker App
Starry Landscape Stacker

Starry Landscape Stacker Mac Starry Landscape Stacker App

Starry Landscape Stacker Starry Landscape Stacker How To Use SLS; Enter the Mac-only software Starry Landscape Stacker (SLS), which blends multiple high ISO star point shots to reduce noise while keeping your stars sharp (For PC users, your solution is Sequator, which operates and yields similar results to SLS.

Starry Landscape Stacker

To help reduce noise in high ISO shots, stacking is becoming a popular option for astro-photographers. First, you must take a number of shots back-to-back with as little delay between them as possible. This means you won’t want any kind of 2-second delay or long exposure noise reduction turned on. Second, you’ll take anywhere from 4-20 shots. We recommend staying in the 8-12 shot range for best results and ease of use. When you get home, you’ll do some minor pre-processing of the RAW files and save them as uncompressed TIFF images. Next, you’ll load them into a software program that will align them and stack them using median averaging. For PC Users, we recommend using Sequator (click HERE for that procedure). For Mac Users, we recommend the program called Starry Landscape Stacker. You can view the PDF below for our Starry Landscape Stacker Procedure where we walk you through our best practices.